Load hoisting device



July 10, 1951 R. o; PITMAN EI'AL 2,559,733

LOAD HOISTING DEVICE Filed Nov. '7, 1949 2 Sheets-Sheet l Ennentor Bu Pay/77000 8772700 Gttorneg u y 1951 v R. oi PITMAN ETAL 2,559,733

LOAD HOISTING DEVICE Fi le dNov; 7, 1949 v 2 Sheets-Sheet 2 attorneys Patented July 10, 1951 UNITED STATES Tam ()FFlCE.

LOAD HOISTIN G DEVICE Raymond O; Pitman and Raymond F. Pitman, Kansas City, Mo.

Application November 7, 1949, Serial No. 125,924

This invention relates to aload hoisting device and more particularly to a hoisting crane adapted to be mounted on a wheeled vehicle.

The principal object of the present invention is to provide a hydraulically operated two-way piston for rotating the mast of the hoisting crane to move the crane laterally in either direction;

Other objects of the present invention are to provide a framework structure on a support such as the platform or bed of a truck; to provide a rotatable mast or post on the support; to provide aboom or crane on the mast; to provide means for raising and lowering the boom; to provide a hydraulically operated cylinder having a piston dividing the cylinder into two compartments; to provide rods for the piston in the cylinder; to provide a pulley horizontally on said mast; to provide pulleys on each end of the piston rods extending from the cylinder; to provide a cable for running over said pulleys and said horizontal pulley on the mast; to provide fluid pressure for operating the piston in said cylinder for. rotatin said mast laterally with respect to the supporting member; to provide a cable and chain for raising and lowering a load through the boom; to provide a winch for said cable; to provide means for taking the weight of the lift from the vehicle body when the hoist is in use; andto provide a device of this character, simple, economical to manufacture and efiicient in operation.

In accomplishing these and other objects of the present invention, I have provided improved details of structure the preferred form of which is illustrated in the accompanying drawings wherein:

Fig. 1 is a perspective view of the hoisting device shown mounted on the platform ofa truck.

Fig. 2, is a fragmentary cross section through the device, particularly illustrating the double acting piston in the cylinder and the cable from the boom through the mast to the drum.

Fig. 3 is an elevational fragmentary view of the frame structure and the mast taken from the side of'the device illustrating the end of the piston in the cylinder and the pulley on the mast.

Referrin more. in detail to the drawings:

l designates a hoisting mechanism, embodying the featuresof my invention, supported on a platform or bed 2 of a truck 3. The device consists of a'framework 4 comprising front legs 5 and rear legs 6 connected at the. top by a ridge rail ,1 which extends, outwardly from the. front legs as best illustrated inFig. 1. The lower ends of, the legs are fastened to the bed of, the truck in; a suitable manner, the front legs being secured be- 4 Claims. (01. 2-12-66) 2 tween channel irons 8 running across the truck had.

Mounted vertically on the bed 2 of the truck is a mast or post ID, the lower end bein secured to the bed through a bearing plate I l and theupper end engaging in a bearin l2 secured to the end ofthe ridge rail las best illustrated in Fig. l.

A plate or shelf 13 is rigidly mounted bywelding or other suitable means to the lower portion of the legs 5 and 6" and rigidly secured to this shelf or plate is a bearin It for the mast [0; A pulley I5 is rigidly secured to the mast above the platform and is" braced thereon by brackets on the like I6 and [6. The axi of the'pull'eyis in substantially vertical position. The pulley l5 has two grooves I! and I8 connected by a slot l9.

Mounted on the shelf 13' between the posts 5 and, 6 is a cylinder which is secured to the shelf by means of brackets 2| weldedior otherwise suitably attached thereto as indicated at" 2| (Fig. 3). The brackets 2! extend aroundthe periphery of the cylinder 25, the free ends being providedwith bolts or other suitable clamping devices. The cylinder is provided with a, piston 22 dividing the cylinder into compartments 23 and24. Piston rods 25' and 25 are secured to the piston and extend outwardly through aboss provided with a fluid retaining ring at the ends of the" cylinder as indicated at 2T and 28. Mounted on .the ends. of the piston rods by brackets 29 and 30' are pulleys SI and. 32. A U-shaped bracket 33" is rigidly secured to the plate I3 and eye bolts: 3'4 and 34' are provided for connecting the endsof'alcable 35 to the bracket 33. The cable' 35 is attached securely to horizontal pulley 15' by a: keeper 36 extending transversely of the slot I9.. The cable is fixed to the horizontal pulley l5 by the keeper 36"substantially at its center. The cable is thus divided into two portions of sub-- stantially equal lengths, each extending around the pulley I5 in their respective peripheral grooves i'l'and l8, guided away and crossin each other at 3'. by idler guide pulleys 33 and 39 continuing to-the pulleys 3| and 32 and extending through and securely attached to eyes of bolts and 34 as indicated'at 40 and A fluid medium is provided for the compart-- ments of the cylinder as indicatedat Hand is: supp-liedv thereto from a sum by-a pump 44 through a four-wayvalve 45. While I have here shown the supply fromtthe sump, it will be obviousany source may be utilized or supplied hydraulically from the motor vehicle.

A,-line.46: leads from the sump. 42 to. the pump and a line 4'! to the four-way valve 45; line 48 leads from the four-way valve to the compartment 23 of the cylinder; 2. line 49 leads from the compartment 24 of the cylinder to the four-way valve and a line 59 leads from the four-way valve to the sump.

A boom is pivotally secured to the mast above the brackets l5 and It by a bracket 52 and bolt 53. The boom consists of a tubular member 54 adapted to accommodate a rod 55, slidably secured in the tube and held in place therein by a pin 56, extending through openings in the tube and rod as in the usual practice for adjusting the boom to the desired length. The outer end of the rod 55 is provided with a head 51, having depending brackets 58 between which is mounted a pulley 59 adapted to receive a cable 69 which extends underneath the boom and is held in place by loops 6! and the opposite end wound over a drum 62. The end of the platform 2 of the truck near the cab thereof is cut away and the drum is mounted therein by brackets 63. The drum may be operated from the truck or an independent source (not shown) as is the usual practice. The outer end of the cable is secured to a chain or the like 64 for attachment to the object to be lifted by the hoist. A pulley 95 is mounted on the pin 53 at the pivoted end of the boom and extends through an opening 5 in the mast. The cable 69 runs through an opening in the mast as indicated at 55 (Fig. 2), up through the mast, over pulleys 65 and 66 mounted in the respective ends of the ridge rail 7 and down to the drum 62.

The head 52' has upwardly extending brackets Bl provided with a pulley 98 adapted to receive a cable 69 having one end secured by a hook to a loop ll secured to the upper end of the mast Ill. The cable runs over pulley 59 and pulley 12, mounted in brackets '33 on the upper end of the mast and thence runs downwardly over a pulley 14 secured by brackets to near the center of the mast, and has its end secured to a drum or winch TS operated by a crank Tl rigidly secured to the upper side of the boom 5| for raising and lowering the boom as is the usual practice.

A brace 73 is rigidly secured between the front legs 5 of the frame and secured thereto is a plate 19 to which is secured a, bearing ,89 for the mast so that the mast is freely rotated therein, as well as the bearings H and [2 at its lower and upper ends.

Rods or tubular members 8! and 82 are secured to the respective sides of the bed 2 in the channels of channel iron 8 and are bent rearwardly and are secured together at their opposite ends by a cross bar 83 rigidly secured to the posts 6 by Welding or other suitable means. Rods 84 having one end secured to the cross bar 83 and their opposite end secured to the upright posts 5 provides further bracing for the framework structure and cross rods 85 are provided between the side rods 3! and 82 and the rods 84. Rods 86 and 81 are also secured to the side rods 8i and 82 and to the front posts 5 of the framework structure to provide a more rigid structure The frame structure just described provides protection for the hydraulic cylinder and cable mechanism underneath thereof.

. Underneath the bed 2 and extending outwardly from each side thereof are eye beams 88, the outer ends of which are provided with a cylindrical member 89 centrally bored as at 90 to accommodate posts 91, secured to a base 92 so that when the hoist is in operation, the majority of the weight will bear on the ground rather than on the truck bed. The posts 9| are provided with a 15 plurality of openings 93 and the cylindrical member 89 provided with openings 94 adapted to register therewith to accommodate removable pins 95, thereby providing means for adjusting height of the post 9 l Operation of a device constructed and assembled as described is as follows:

When the truck is moved to the desired place for loading of an object, the posts 9| are adjusted so that the base 92 will rest on the ground and the chain 64 secured to the load. The boom 5| is raised and lowered through operation of the drum [6 by movement of the crank TI. The chain 64 is raised or lowered by the cable 99 through the operation of the drum 62. The load thus may be raised to the desired height through operation of the drum 62 or 16 or both' Rotation of the mast and movement of the crane laterally is accomplished through operation of the hydraulic piston 22 in the cylinder 20 and the reaction thereof on the cable 35. When it is desired to move the crane to the left, the valve 45 is opened by lever 96, as shown in the position in Fig. 2, allowing fluid medium to pass through line 41 and 48 to the compartment 23, to move the piston 22 to the right, extending the piston rod 25 and pulley 32 outwardly as shown in dotted lines. This movement draws the cable 35 to the right. The cable being fastened securely to pulley l5 by keeper 36 will cause clockwise movement of pulley. l5 and boom 10. In this movement the fluid in compartment 24 will move through line 49 back to the sump 42. When it is desired to move the boom to the right, the valve is turned by its handle 96 so as to connect line 41 with line 49, and connect line 48 with line 59 so that the pump 44 will force the fluid into compartment 24, and allow the fluid in compartment 23 of the cylinder to move to the sump 42 and move the piston to the left to extend the piston rod 25 and pulley 3| to rotate the pulley l5 in an anti-clockwise direction.

It will be obvious from the foregoing that I have provided an improved hoisting device in which the mast is rotated by a double acting, single piston cylinder operated hydraulically from a source of fluid supply by a cable operating over a pulley secured to the mast of the hoisting mechanism.

What we claim and desire to secure by Letters Patent is:

1. A hoisting device comprising, a frame mounted on a support, said frame having a ridge rail extending outwardly from said frame, a boom supporting upright mast having its lower portion rotatably mounted on said support, means on said extending ridge rail rotatably supporting the mast adjacent its upper end, a platform rigidly secured to said frame, a pulley mounted on said mast having its axis in substantially vertical position, a cylinder horizontally mounted on said support in substantial horizontal alignment with the pulley on said mast, a piston in said cylinder, rods secured to the opposite sides of said piston and extending outwardly through the respective ends of said cylinder, a pulley on the outer end of each rod, a cable engaging over the pulley on the mast and said pulleys on said rods, means for securing the free ends of the cable in fixed relation to said cylinder, fluid means for operating said piston in, said cylinder for rotating said mast, said pulley on said mast having two grooves, and a slot in one side of said last named pulley connecting said grooves for accommodating said cable in substantial alignment therewith.

2'. In a motor vehicle having a platform body, in combination a frame mounted on said body, a boom supporting mast rotatably mounted on the body adjacent said frame, a pulley mounted on said mast in a horizontal position, said pulley having two grooves therein and a slot connecting said grooves, a shelf mounted on said frame, a cylinder mounted horizontally on said shelf, a piston in said cylinder, rods secured to opposite sides of said piston and extending outwardly through the ends of said cylinder, a pulley mounted on the end of each rod, rollers mounted on said platform adjacent said cylinder, a cable having its free ends secured in fixed relation to said cylinder, said cable running over the pulleys on said piston rods and engaging said rollers and crossing each other for engaging in the grooves on said horizontal pulley, and fluid means for operating said piston in said cylinder for rotating said mast.

3. In a motor vehicle having a platform body, in combination a frame mounted on said body, a boom supporting mast rotatably mounted on the body adjacent said frame, a pulley mounted on said mast in a horizontal position, said pulley having two grooves therein and a slot connecting said grooves, a shelf mounted on said frame, a cylinder mounted horizontally on said shelf, a piston in said cylinder, rods secured to opposite sides of said piston and extending outwardly through the ends of said cylinder, a pulley mounted on the end of each rod, rollers mounted on said platform adjacent said cylinder, a cable having its free ends secured in fixed relation to said cylinder, said cable running over the pulleys on said piston rods and engaging said rollers and crossing each other for engaging in the grooves on said horizontal pulley, and fluid means for operating said piston in said cylinder for rotating said mast.

4. A hoisting device comprising, a boom supporting upright mast rotatably mounted on a support with the axis of rotation substantially vertical, a member having an arcuate periphery fixed on the mast in horizontal position with said periphery coaxial with the axis of the mast, spaced peripheral grooves in said member, a cylinder mounted on said support, a piston in said cylinder, rods secured to opposite sides of said piston and extending outwardly through the respective ends of said cylinder, a pulley on the outer end of each rod, a cable, means securing said cable to said member for operation in the peripheral grooves thereof and over said pulleys on said rods, means securing the free ends of the cable in fixed relation to said cylinder, and fluid means for operating said piston in said cylinder for rotating said mast.

RAYMOND O. PITM'AN. RAYMOND F. PITMAN.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 508,122 Robinson Nov. '7, 1893 2,071,905 Smith Feb. 23, 1937 2,446,586 Harbaugh Aug. 10, 1948 2,489,326 Rockstrom et a1. Nov. 29, 1949 

